Fort Worth daily gazette. (Fort Worth, Tex.) 1882-1891, 1887-01-31
POPULAR SCIENCE.

Paper roofs, which are fire-proof and
give promise Of almost indefinite dura.
bility, are now made.
A mathematician estimates that ma
chine of one-horse power would keep y,
600, 900 watches running.
The Juice of a lemon in cup of strong
coffee without sugar is offered as remedy
for sick headache.
The largest locomotive in the world is
the Decspo, built by the Baldwin Loco
motive Works, in this city, last year. II
weighs 600 pounds.
Rubber rollers may be turned by an
emery wheel. A circular saw will also
give good results, and printing press ink
rollers may De nicely trued up with a
fne-toothed, well-breasted cirCulsr saw.
An incandescent lamp which requires
no vacuum in the globe has been invented
in Germany. The wire used is mixture
of conducting and non conducting ele-
ments, the latter preventing the former
from melting.
A pine floor washed with q solution of
one pound of copperas in gallon of
strong I've will appear very like an oak
floor. The solution is also useful as an
exterminator of insect pests so destruc-
tive to carpets and other wooden goods.
1t has been found that compressed teak
may be made to serve some of the pur-
poses for which lockwood, which is rapid
ly becoming scarce, is now being used. A
powerful hydraulic press tor COMPRISING
teak for loom shuttles has just been made
in Manchester, England.
1t Is estimated that the varied machin-
cry OF Great Britain now operated by
steam power is capsule of performing
more work and hence producing more
products, than could be effected by the
labor of 40O, OO0,O 600 able-bodied men, a
greater number than all the working men
on earth.
Pasteur's method appears after all to
be fallible. The announcement is made
that two more patients who had been bit
ten by mad dogs and then inoculated by
Pasteur have died. OF the fifty -four per-
sons bitten by wolves and inoculated by
Pasteur fourteen have now died, which is
the usual percentage.
The temperature at which the common
gases become liquiied are given as fol-
lows by Professor Dewar, the numbers
expressing degrees below zero Fahren-
heit: Carbonic acid, ll2 nitrous oxide,
1902; ethylene, the chief Illuminating con-
stituent of common coal gas, l541';
oxygen, 2990; nitrogen, 1872; air, Sl4'
carbonic oxide, 2l59.
The French journal of Hygiene esti-
mates the pr" liabilities of life for mod
crate drinkers and total abstainers as
follows: moderate drinke- at 90 years
may expect to live about fifteen years; at
so twelve years; at 40 ten years; at so
eight years. The hope OF total alb
stainer is: At % years forty years of life;
at 80 about thirty-six years; at 40 about
twenty-elght years; at so twenty-one
years; at 60 fifteen years.
In order to learn why there is so much
sulphur in stone c. al and so little of free
alkaline carbonates in the ashes, NJ. Dieu-
lefalt has analysed the surviving species
of the families of coal plants, particularly
the equlsetace sc, and has found in them
an unusually large proportion OF sui
phuric acid. He concludes, therefore,
that the coal plants were more highly
charged with sulphur than most existing
plants, and that for that reason their al